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McDowell&Davis Towing <br /> Risk Assessment and Conceptual Site Model <br /> EExposure to groundwater impacted b the releases should not cause <br /> Y in-crease in cancer or <br /> C toxicant risk. The possible increased risk posed by the volatilization of the residual <br /> subsurface soils into the interior of the commercial building may be a conservation <br /> artifact of the model. The interior of the McDowell and Davis office should be monitored <br /> for the possible migration of contaminant vapors from the subsurface soils into the <br /> building. A passive soil vapor survey of the building interior and areas of onsite-exposed <br /> soil should be conducted to confirm the model. Groundwater monitoring should continue <br /> through the November 2002 event to provide two years of groundwater data. <br /> b-2-- <br /> A closure request shoulAubmitted for regulatory consideration with the report of the <br /> November 2002 groundwater monitoring event, if the soil gas survey is negative and <br /> there are no significant groundwater changes. <br /> The above represents our best professional opinion as to environmental conditions at this <br /> site. These opinions were derived using data at hand, and standards of care common to <br /> the environmental consulting community in Northern California. There is the possibility <br /> that even with proper application of the above methodologies, there may exist on the <br /> subject property conditions that could not be identified within the scope of this sampling <br /> work or which were not reasonably identifiable from the available information. The <br /> methodologies included in this report are not intended to produce all inclusive or <br /> comprehensive results, but rather to provide the client with information regarding <br /> apparent suspicions of existing and potential adverse environmental conditions relating to <br /> the subject property. Additional work at this site may generate data that could lead to a <br /> EC, change of opinion regarding conditions or appropriate remediation procedures or both. <br /> Prepared by: � <br /> i � <br /> :€ JLR"ESI FG'j i v <br /> ° Ex�- � <br /> Robert Fourt, CHG FOr CA <br /> Certified Hydrogeologist #180 <br /> kNV J JtOHk't*r <br /> KtOBF� <br /> d2�7 <br /> Michael J. Kloberdanz, A, REHS No.02157 <br /> California Registered Environmental Assessor 402157 <br /> Expires: <br /> California Registered Environmental Health Specialist#4783 <br /> r <br /> 0 CALOO <br /> 7 <br />